Effect of triazinone on root growth and gravireaction |
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Authors: | Masami Ogawa Paul-Emile Pilet |
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Institution: | Inst. of Plant Biology and Physiology of the University, 6 Place de la Riponne, 1005 Lausanne, Switzerland;Agricultural Chemicals Research Lab., Sankyo Co., Ltd., Yasu-cho, Yasugun, Shiga 520–23, Japan. |
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Abstract: | The effects of a synthetic growth promoter, 4-ethoxy-l-( p -tolyl)-S-triazine-2,6 (1H, 3H)-dione TA], on growth and gravireaction of Zea mays L. (cv. LG 11) roots were investigated. In horizontal, intact roots, pretreatment with TA at 4 × 10?4 M inhibited the gravireaction. If the pretreated roots were rinsed with a buffer solution before incubation, the TA effect was reduced, indicating that a continuous presence of TA was necessary for its maximal activity. On the other hand, the TA pretreatment (1×10?5, 1×10?4 and 4 × 10?4 M ) promoted the elongation of these roots. The TA effect was stronger for illuminated roots than for those kept in darkness. TA also decreased the lateral curvature of half-decapitated roots maintained vertically in light. This indicates that the action of TA could be associated with some growth inhibiting substances produced or released in cap cells. |
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Keywords: | Maize Zea mays |
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